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In this paper, we study hybrid overlay/underlay spectrum sharing in cognitive two-way relay networks with an opportunistic relay selection scheme. Different from the traditional interference power constraint, we adopt primary users' (PU) outage constraints to guarantee the QoS requirement of a primary system. The exact closed-form expression for the outage probability of a secondary system is derived...
Cooperative communications achieve tremendous improvements in system performance. Meanwhile, it tends to change the conventional access and transmission schemes in wireless networks. Thus, CoopMAC is proposed and analyzed for fully connected WLANs. It improves the performance of the network dramatically by enabling additional collaboration from other nodes. However, how does it work in multi-hop Ad...
Cognitive radio is a highly promising technology to efficiently solve the spectrum scarcity challenge and harmonize the networks heterogeneity. Through component spectrum sharing, secondary users (SUs) are able to opportunistically access licensed spectrum shared with the primary system. In the literature, spectrum sharing is normally investigated on the basis of the assumption that the spectrum sensing...
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